Show Media Router toolbar icon ephemerally for MR dialogs

chrome/browser/ui/webui/media_router/media_router_web_ui_test.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_UI_WEBUI_MEDIA_ROUTER_MEDIA_ROUTER_WEB_UI_TEST_H_
+#define CHROME_BROWSER_UI_WEBUI_MEDIA_ROUTER_MEDIA_ROUTER_WEB_UI_TEST_H_
+
+#include "chrome/test/base/browser_with_test_window_test.h"
+
+class MediaRouterWebUITest : public BrowserWithTestWindowTest {
+ public:
+  // |require_mock_ui_service_| defaults to false in the default ctor.
+  MediaRouterWebUITest();
+  explicit MediaRouterWebUITest(bool require_mock_ui_service);
+  ~MediaRouterWebUITest() override;
+
+ protected:
+  // BrowserWithTestWindowTest:
+  TestingProfile* CreateProfile() override;
+  BrowserWindow* CreateBrowserWindow() override;
+
+ private:
+  // When this is set to true, MockMediaRouterUIService is instantiated.
+  // Otherwise, no MediaRouterUIService is instantiated.
+  bool require_mock_ui_service_;
+
+  DISALLOW_COPY_AND_ASSIGN(MediaRouterWebUITest);
+};
+
+#endif  // CHROME_BROWSER_UI_WEBUI_MEDIA_ROUTER_MEDIA_ROUTER_WEB_UI_TEST_H_